Telephone system



Jan. 2,1945. J. E. QSTLINE 2,366,647

TELEPHONE sYs EM Original Filed Ju ly 26, 1941. 3 Sheets-Sheet l INVENTOR. Joh n E. Osfling M M m ATTORNEYS Jan. 2, 1945. J. E. OSTLINE 2,366,647

TELEPHONE SYSTEM Original Filed July 26; 1941 3 Sheets-Sheet 2 as Substation 304 Po rfy Line Switch 32o M307 MEI? 50 Sub. 303 50" Sub.3l3

" l6- Sub. 3o| M30 MNEP'HI 16 Sub.3||

INVENTOR. John E. Osfline BYM,XA%,M m

ATTORNEYS J. E. OSTLINE TELEPHONE SYSTEM Original Filed July 26, 1941 Repeater 400 3 Sheets-Sheet 5 c471 3470 (R440 'T'1 b "R 20 Polar f/ 45 4:462 G- F q 44| In 480 L-F R450 C472 {f4 4 C482 1| 432 431 c473, c C483) I v 4o3 c474 J Manual I i Opemfvr To Individual 0 Connectors 5,

. Repeater I30 66' 50" 33 l6 N Party Party Party Party ,3 Conn u Conn Conn. Conn.

INVENTOR. I John E. OsHine 'O W I W,MM

ATTORNEYS Patented Jan. 2, 1945 T OFFICE TELEPHONE SYSTEM John Ellis .Ostline; Chica matic Electric Labora of Delaware Original application Jul 404,103. Divided and t ber- 14, 1942, Serial No. 10 Claims. (Cl. 179 90) proved arrangements for identifying calling stations on party lines in automatic telephone systerns of the measured service type. This applica- 1 tion is a division of the copending application of John E. Ostline, Serial No. 404,103, filed July 26, 1941. 1 i The principal object of the invention is to pro-' vide an improved calling device which is adapted to be utilized in an improved arrangement for identifying calling 3, loss. I telephone system disclosed in S. Peterson, granted September In the automatic the above-mentioned Peterson patent, an ar atthe various stations on the associated party switching apparatus is s connected and arranged Accordingly, it is another object of theinven tionto provide in a telephone system of the type construction and which is economical to manufacture and thoroughly reliable in op eration'.

in this system, the.

go, 111., assignor to Autotories,.Inc., a corporation y 26, 1941, Serial No. his application Septem- Fur'ther features of the invention pertain to the particular arrangement, of the mechanical elements of the calling device and of the circuit elements of the telephone system, whereby the above-outlined and additional features are attained.

The novel features believed to be characteristic of the invention are set forth with particularity in the appended claims. The invention; both as to its organization and method of operation, together with further objects and advantages there- .of, will best be understood by reference to the following specification taken in connection with the accompanying drawings, in which Fig. 1. is a rear View of a calling" device embodying the present invention; Fig. 2 is aside elevational view of the calling device shown in Fig. l; and Figs. Sand 4 taken together illustrate diagrammatically a telephone system embodying the present invention. 1 1

Referring now more particularly to Figs. 1 and of the drawings, there is shown a calling device 10 of the finger dial type and of the general construotion and arrangement of that disclosed in V U. S. Patent No. 1,642,822, Herbert F. Obergfell, granted September 20, 1927, which has been modified toembody the present invention.

More particularly, the calling device l0 comprises a casing H, a rotatable arborl2, a finger wheel or dial I 3 secured to an enlarged boss l4 provided on the outer end of thearbor l2, and a cooperating finger stop I5. The finger wheel '13 has ten spaced-apart openings therein, not shown, which are adapted to receive the finger of the user and whichrespectivelycorrespond to the digits 1 to 0, inclusive. Also, a coil spring we: provided in surrounding relation with respect to the arbor l2, the inner end of the coil spring being secured to the casing I I and the outer end thereof being secured'to the outer end of the arbor l2. The rear wall of the casing II carries a bracket 11, the bracket being secured in place by two spaced-apart screws l8. The bracket l1 carries a set of impulse spring l 9 and 20, a set of shunt springs 2 I, 22 and 23, and a set of cam springs 24 and 25.

The inner ends of the impulse springs I9 and 20 are suitably insulated from each other and from the bracket I! by 'a' plurality of strips of insulating material 26 and are retained in clamped position by two screws 21. Also, the impulse springs 19 and Zilare respectively provided with electrical terminals 28 and 29. Similarly, the inner ends of the shunt springs 2|, 22 and 23 are suitably insulated from each other and from the bracket I! by a plurality of strips of insulating material 30 and are retained in clamped position by two screws 3|. Also, the shunt spring 2|, 22 and 23' are respectively provided with electrical terminals 32, 33 and 34. Finally, the inner ends of the cam springs 24 and 25 are suitably insulated fr m h ther an f om the bracket U by c rtainof the strips of insulatingmaterial 30.. andv are retained in clamped position by the two screws 3|. The electrical terminal 33 is common to the shunt spring 22 and the cam spring 24; while, the; cam spring 25 is provided with an electrical terminal 35.

The cam spring 24 carries tW0.,Sp2iCd--ap3i1t and inwardly directed tabs 36 intermediate its ends which support a pivot pin 31. upon which a pawl 38 is pivotally'mounted, Th outer end oi,

the pawl 38 is biased in a counterclockwiscdii rection about the pivot pin 31, as viewed, in Fig. l, by a leaf spring 39, the outer end of the lca spring 39 extending nt a. recess pr vided the paw 33: and th inner end. of the.- leaf: spr ng 9. b i g clamped to. the. bracket H by the screws 3!... 'l h arbor l2v carries arixtu e- M w learnt he outer end thereoi and an; annular. insulating cam 4! on the extreme outer end thcreoi the fixture 4(1 and the cam 41 being retrained place-bye screw 42. Thefixture- 40 ls-proyided with. an outwardly extending impulse ring control arm 43, and. an. outwardly extending; shunt spring control arm 44. the arms 43 and 44.1oeingarranged. in radially spaced-apart. relation... The. peripheral edge; of the cam 41-. carries one, two,- or three projections 45 three. projection 45. being illustrated inythe. present ex mple; The impulse spring 20. carries; an insulatingoont ol m mb r fi which ooperates w h the-contro arm 3; andthe shunt. sprin 3- oarri s an insulati g, control member 41 which.

cooperates with the control arm 44.

E r hen. the callingclev ce In comprises mechan sm, n sh wn, hou ed inthe casing I l. which ineludes'a gear train. and a connectedimpulse sp ndle; lit xtendin throu h an opening Ho pro ided! n therear wall; of. th a no H. The uter: end. of; the, impulse spindle 48. carries an, impulse cam Git-whip .Qoperateswith the exs uterend oiit mpulse-spring l Wh n th finger dial .3 o cupies its normal; po ition the-arbo i2 is biased in, a clockwise'di,- motion. a ed E i-st. by the coil spring t3; wher in. the. co r l 43 carried. y the. Entire; 44 engages. hecontro z member 46in. order to. rge the impu se springs ta andv 28; into err aag me and h control. arm. 44. arried by: the fix l= engages, the, control. member 43, in order-to meet-hesitant prin s, 24-. 22. and zairito. disen a ement. At: this point it is noted t a the spring 3; normally biased toward. Z2 clue to its; own. resiliencythe-projecti ns dis sed orw rd y i a respecto the ou er. nd. oi

paw 35 is b ased in counterclockwise dirent-ion bout i ot 3J1 by the; leaf. spring 39.

order to pe ate. the. all ng; d vice H1; the

ns ata one fhahcles pro- W c l l3 co responding: tothe: di: rotates: the; finger.- ....terclock;wise.- direction; as ew d. i Bi L, until; his fing r: enga esr the; fingerstop, 1:5; and then,- releases:t-he-;f1ngerwheel: l-3.-. When thefinser: wh e l3. nd; the arbor t2: secured thereto are rotat d.

clockwise directionxwith a courliterclockwise direction, the coil spring I6 is wound and the mechanism housed in transmit the digit thus registered. More particularly, when the arbor i2 is rotated in a counterclockwise direction the control arm 43 carried by the fixture 40 disengages the control member 46, thereby o allow the impulsesprings l9; and 2a to move, while; maintaining engagement: therebetween, toward and into cooperating relationship with respect to the impulse cam 49; however, the impulse. spindle 4B and the impulse cam 49 carried' thereby are not rotated prior to the release of. the' finger wheel: 13.. Also, when the arbor I2 is rotated in the counterclockwise direction the control arm 44 carried by the fixture 40 disengages.theicontrolmember 41, whereby the shunt spring 23;. is moved into engagement with the shunt spring 22; and forces the shunt spring 22 into, engagement with the shunt spring 2| due to the inherent resiliency of the shunt spring 23, as previously noted. Einally, as; the arbor, I2 is rotated in. the. counterclockwise direction, the; projections 4.5- carried; on. the periphery of. the. cam. 4t ride overxthel. outer end of. theepawl 38. and; therebehind. More; specifically, when. one of..- thaproiections 45; carried by the periphery of the. cam; 4:l: engages; the. outer; end of the. pawl 33, the pawl38' is pivoted about the pivot, pin 31 in a clockwise direction, the biasof the leaf spring 39; however, the. cam spring 24;.is; notmovedinto; engagement with the cam spring 25- duerto, thisactionof the pawl 38. When the, projection 45 carriedonthe periphery. oi. the. cam 4|; rides over the outer end of the.

35 pawl 3.3; and therebehind,,therleaf: spring 3-9 piVots fit) Gil

45lc-arriedby thecam 4| are l th pawl 38:; and.

rearysurface of the pawl 38: in. the. counterclockwis-.- direction; about the; pivot pin 31 backinto. its normal position, without; moving the cam spring; 2-4 into en,- gagement withithercam spring; 25.

At" this; time; when theflngers wheel I3 is re. leased; it returned in the clockwise; direction, as. viewed Fig; 1,. by: the coil spring L6 back into= its normal position, whereupon, the. mechanism housedi in." the casing, H rotatesv the; impulse, spindle 48: an appropriate amount. corresponding: to; the digit registered; Atathistlmfl. the: outerendi 'Qii thes impulse spring L9, is} arranged: in cooperating relationshipwith respect tothe impulse: cam. 4191-. dueto that. disengagem t2 between the.- control arm 43 carried by;thafiiiturewwrand. the"; controlamemhers 4&carried; by the;.impulse;, springs 211i; accordingly, eachztime; an end of; the cam 4.9% engagesthes outer end: of they;v impulse-r spring I 9? the: impulse: spring 1:9 movedput; of enga ementwitlr the impulsespringim. Hence; the; opeposite ends of the impuismcam:49:alternately"en:- gage; andrdisengageathes outer end: oitthe: impulse spring: l9 ,therebyalternately to moveethe' impulse spring; l-.9;- into. disengagement and to; permit itito; be; returned; into engagement. with theimpulse spring 205;. whereby the. calling; device to transmits at number" of impulses-byway of thedmpulse: springs: I59 and 20. corresponding; to; the: digit: registered... I

Also, when cam 411-; carried; on. the: outer; endof. the: arborr l 2 is: rotated in a .clockwi'sey direction, as; viewed in. Fig. 1}; whereby the pro'iections lir carried; onthc penipheryof thezcam 41: alternately; engage and;

disengage the outer end of the pawl 38. Moree particu1arly;. wherronet of? the proiectionsa li' carpied; on: the periphery of: theacan'rl tt enga es: the; the: outer; end. oftherpawl. 38. thee pawl .38 is; urged. in acounterclockwise. directiom about the pivot pin 31, as viewed in Fig. l;;. how

the casing II is 'set to.

as viewed in Fig. 1, against;

the finger whack. Nils-released. the":

2,366,647 r i i 3 evenmovement of thepawl 38 in the counterclockwise direction about the pivot pin 31 is blocked due to the arrangement of th pivotal mounting of thepawl 38 upon the cam spring24. Accordingly, at this time the paw138 is forced outwardly and downwardly away from the engaged projection 45 carried on the peripheryof the cam 4! in order to. force the cam spring 24 into engagement with the camyspring 25. Subsequently, when the projection 45carriedon the periphery of the cam 4i rides over the outer ends ofthe pawl 38, the pawl 38 and the cam spring 24 are returned to their normal positions due to the inherent resiliency of the cam: spring 24,. whereby the cam spring 24 is moved into disengagement with the cam spring 25. Accordingly, as the arbor i2 is rotated in the clockwise direction back into its normal position the pro jections 45 on the periphery of the cam 4| cause the cam springs .24 and-25 to operate into engage- I ment and disengagement a like number oftimes,

whereby the calling device in transmits a number of impulses by way of the cam springs 24 and .25 corresponding to the number of projections 45 provided on the periphery ofth cam 4!.

Just prior to the time the arbor I2 is rotated in. the clockwise direction completely back into its normal position, the control arm 43 carried by the fixture 40 engages the control member 46 carried bythe impulse spring 20 and forces the impulse spring .20 away from the impuls cam 49, whereby the outer end of the impulse spring is is forced out of cooperating relationship with respect to the, impulse cam 49 in order to prevent any further operation of the impulse cam 49 from operating the impulse spring l9. Ultimately,

when the arbor I2 is rotated in the clockwise direction into its final normal position, the control arm 44 carried by the fixture 40 engages the control member 47 carried by the shunt spring 23; wherebythe shunt spring 23 is forced out i of engagement with the shunt spring 22 and the shunt spring 22 is forced out of engagement with the shunt spring 2| ,due to its inherentresiliency. Also, when the arbor l2 has been rotated in'the clockwise direction to its final normal position. th last projection 45 carried on the periphery ofthecam 4! has operated'the associated pawl 33, in the manner explained above.

At this point, it is noted that .the arrangement of the control arm 43 carried by the fixture "40- and the control member 46 carried by the impulse spring .zois socoordinated with respect to the mechanism housed in the casing II that all of the digits registered in the mechanism have been transmitted by way of the impulse springs liliand 26 a slight time interval prior to the final return of the finger wheel 13 and the connected arbor l2 into their normal positions. Also, it is noted that the shunt springs 21, 22 and Bare moved into disengagement only upon the final return of the finger wheel 13 and theconnected arbor l2 intotheir normal positions; while the. last projection 45 provided on the periphery of the cam 4| operates the associated pawl 38 just prior to the final return of the finger wheel I 3 and the connected arbor l2 into their normal positions. The cooperation between the elements mentioned positively insures that the cam springs 2!, 22 and 23 are operated into engagement at all times when the finger wheel I3 is away from its normal position; While the finger wheel l3 i must be moved a predetermined distance from its normal position in order to cause the first digit 1 to be effectively registered in the mechanism housed in the'casing ll. Also, the cooperation between the elements mentioned above permits control of the cam springs 24 and2'5 to send. one impulse in excess of the number of impulses in the digit registered in the mechanism housed in the casing II when the digits 1 and 2 are registered. therein; By way of illustration, it is pointed out that, in the present embodiment of i the calling device in, when the digit 21is, registered in the mechanism housed inthe casing H,

in order to cause the impulse springs land 2i] to be controlled to transmit two impulses, the.

cam springs 24 and .25 are controlled to transmit three impulses, three projections 45 being provided on the periphery of the cam 4|. Further,

itwill be understood that the number of projections provided on the cam 45 may be varied in order to obtain selective control'of the associated switching apparatus; however, in the present embodiment it is contemplated that the cam 4lwill' have no projections 45 thereon or l, 201' 3=projections thereon, thereby rendering the calling device in capable of .fourmodifications, in an obvious manner, as will be explained more fully in conjunction with the telephone system in which the calling device lil isincorporated.

Finally it is noted that the cooperation between the elements mentioned. above is such that the impulses transmitted by way of the cam springs 24 and 25 and the impulses transmitted by the impulsesprings l9 and 20 are transmitted alternatively. In the present example, when any digit between 2 and is dialed the cam springs 24 and 25 operate to transmit their first impulse; then the impulse springs l9 and 2a operate to transmit their first impulse; then the camsprings 24 and i 25 operate to transmit theirsecondimpulse; then the impulse springs. i 9 and operate to transmit theirsecond impulse; and then the cam springs 24 and yoperate to transmit theirthird impulse.

Thereafter, the impulse springs I9 and .20 are operated to transmit their third, etc., impulses in the event thedigit dialed is 3, etc.; however,

the cam springs and 25 are not operated to transmit further impulses. i l

Also it ispointedout that the selective control of the cam springs 24 and 25may be effected merelyby suitably adjusting the normal position of the cam 41 upon the outerendof the arbor !2 with reference togthe pawl 38, instead of substituting difierent cams 4! having difierent numbers'of projections 45 on the peripheries thereof,

asexplai-ned above.

Referring now more particularly to Figs. 3 and 4 of the drawings, the telephone system there illustrated comprises an exchange having a plurality of individual subscriber lines, not .shown. terminating thereat, anda plurality of party.

subscriber lines, including the party subscriber lines I24 and M0, terminating thereat, and provided with switching apparatus. Each of the party subscriber lines has four party subscriber substations individually associated therewith; the party subscriber'substations 30I, 302, 303 and 304 being individually associated with the party subscriber line I30. and the party subscriber substations 3| 1, 3I2, M3 and 3| 4 being individually associated with the party subscriber line I20. Each party subscriber substation comprises substation apparatus, including a harmonic ringer.

the four harmonic ringers at the four party subscriber substations on each party subscriber line being respectively tuned to 16, 33, and 66 cycle ringing currents. party subscriber substations 30L 302, 303 and 304 In the present example, the

stations, the cam plurality of. meter switches 350, 310, etc., vidua-lly associated with the party line switches: are, in turn, individually as-. sociated with the party subscriber lines I30, I20,

connected to the, party subscriber lines. [30;- and) the: party subscriber substations: 3 I I5, 342 3I'3-z and.

514: connected to the party subscriberline. I20;

are: respectively 15, 33,. 5'0aand; 66 cycle substations.

Ereferably; the substation apparatus provided. at each party subscriber substation. is'substan. the fourth.

tially' identical to that provided at party subscriber substation 304 connected to: the;

party subscriber line certain; modifications in at, as; noted. more. particularly I30, with the exception. of the calling devices there;

below. The substation. apparatus provided: at the fourth party subscriber substation 304 comprises a harmonic ringer II, a transmitter I02, a: receiver. I03, a

hook: switch S104, an induction: coil I01 and a.

calling device I, the calling device I0 being identical. to: that: disclosed in drawings and: including a. cam 4| three: projections; 45. on: itsv periphery. The substation apparatus providedat the first, second. and. third party subscriber substations I, 302 and 303, respectively, that provided at the fourth; party subscribersubstation 304, except thatin the; calling devices respectively provided at these party subscriber.- sub- 4I comprises no projections 45, one: projection and two projections 45. In view of. the fact that the calling devices provided at thefirst'party' subscriber substations 30.I, 3| I, etc;, each. comprise a cam 4I provided with no projections 45 therein, the" callingdevice provided at. each first party subscriber substation maybe of conventional construction and arrangement and of. the character previously mentioned. Obergfellpatent, wherein the cam' 4I' and-the set of cam. springs 24 and 25.

arereliminated. I

Theiswitc'hing apparatus provided in the exchange comprises a plurality of individualline switches of; conventional connection and arrangement', not shown, individually-associated with the individual subscriber-lines, not; shown, and a plurality of party line switches 320 and 360', individually associated. with the party-subscriber lines, the line switches 3.2.0. and 360 being'respectively individually associated with the party subscriber lines I30 and I 20; Also; this.- switching apparatus comprises a 320,. 360', etc;, which etc. Further, this switching apparatus comprises a group of regular selectors, not shown, a-group of, repeater selectors, including the repeater selector 405,, a group of special service selectors, including the special service selector 406, four groups: of individual connectors, not shown, and four groups of party connectors; The first, second, third and fourth 40 3: and 404, which party connectors respectively ring. a line seized thereby with 16, 33, and 66 cycle ringing currents".

Eurther; the, exchange comprises a manualoperator position 0, a toll; operator position H0 and". a plurality of" measured service meters individually associated: with the party subscriber substations; More particular1y,.the meters M305, M306, M301 and M300 are respectively individually associated with the party subscriber substa tions30I, 302, 303 and 304'; and the meters M3.I5,

M316, M3 and M318 are respectively individually associated with the; party." subscriber substat- Figs. 1 and. 2' off theprovided 0 with is substantially identical to of that disclosed in the line switches", including the party indigroups of'party connectors respectively include the party connectors 40 I 402,v

ecorum tions 3.41:, 34.2, 3 I3 and: M4. Finally, the: exchange: comprises: a group-of. repeaters, including the peater 400.

The; apparatus. in

switches has access to the group of regular se l'ectors; while each of the. party line switches 320;.

3.60, etc., hasaccess to each of. the repeaters 400,-

4'10, etc'., indi switch. 35.0 is: individually associated with the party line switch 320: and has accessto the. four" meters: M305, M306, M30! and M308 respectively individually associated with the four party sub-- scriber substations 3.01., 302, 303 and 304 connectedj to the party'subscriber line I30 with which the party line switch 320: is individually associated.

Each of the regular selectors in the group and K each of the repeater selectors in the group have to the party line switch 320,

access: to the group of special service selectors, to the four groups of party connectors, to the four groups of individual. connectors, and to a group, of. trunks extending: to the manual operator po'-- sition 0.. Each of the individual connectors in each of the groups has access to each of'the indi vidualsubscriber lines; each ofthe party connectors in each of the groups has access to each of' the party subscriber lines; and each of the special serviceselectors in the group has access to a group oil. trunks extending to the. toll operator position Preferably, eachof the individual line switches is of conventional connection and arrangement;

whileea'chyof the party line switches is identical switch: 320 comprises a switching mechanism, including a rotary wiper set provided with five :wipers 32L 322, 323', 324 and 325, an associated contact. bank, and a rotary magnet ;M326"for driving the wiperset noted'a Also, the party line'- switch 32-0 comprises a relay network including. a cutofiJrelayR3130 and a' line relay R340.

' Preferably; each of the meter switches is iden tical to? the: meter switch 3'50 which comprises aswitching mechanism including a rotary wiperset provided with a single double-ended wiper- 35I, an associated contact bank, and a rotary magnet M352 for" driving the Wiper set noted. Also, a. set. of switch springs S354 is associated with: the wiper set" of the meter switch 350 and" operated, in a manner more'full explained here-Q inaiter;

Preferably, each of'the repeaters is idential to the repeater 400 which comprises a relay net work; including a digit cutofi relay R4i0,'a meter relayR420, a. dialrelay R430, an answer relay R440, line relayR450', a hold relay R460 and an impedance element 4 I 5.

Preferably, each of the regular selectors and each of therepeater selectors 405, etc., are of' 'the conventional Strowger' type; each of the individual: connectors and each of the party con- =.1 neetors' 401;. etc'.,' are of the conventional Strowger' the: exchange is so connected and arranged that each of the individual line The party line line I30, the contacts completes, at the contacts between the R330. At this point type; each of the special service selectors 406, etc., is or the conventionaldrop-back Strowger type; and the manual operator position and the toll operator position IIO comprise conventional operator position equipment.

In accordance with the trunking plan incorporated in the telephone system, both the regular selectors and'the repeater selectors have access to the first level of the associated contact banks,

to the first, second, third and fourth, groups of 0 tact banks.

The connection and arrangement of the system will best be understood from a consideration of the followingdescription, with reference to Figs. 3 and 4 of the drawings, of the operation of the apparatus incorporated therein to set up the different connections between the various :5

individual and party subscriber substations.

Considering now the extension of a call from the fourth party subscriber substation 304, connected tothe party subscriberline I30, to the first party. subscriber substation 3, connected to the party subscriber line I20, the call is first initiated at the four .party subscriber substation 304 by removing the receiver I03 from its associated switchhook, thereby to operate the hook 7 switch SI 04. When the hook switch SI 04 is thus operated there is completed, at the contacts I05 and I06 thereof, obvious operative connections between the transmitter I02, the receiver I03 and the party subscriber line, I30; whereby a circuit -is completed for energizing the winding of the line relay R340 in the;party line switch 320 individually associated with the party subscriber line I30. The circuitfor energizing the winding of .the line relay R340 extends from ground by way conductor CI32 of r of, the contacts 333, the line the party subscriber line I30, ing of the inductiancoil I01, the contacts I05 of the hook the primary windthe transmitter I02, switch SI 04, the impulse springs I0 and of the calling device I0,

the line conductorCI3I of the party subscriber 33I and the windingof R340 to battery.

When thus energized the line relay R340 operates to complete, at the contacts 342, an obvious path for applying ground potential to the control conductor CI33 of the party subscriber. line I in order to mark the party subscriber line I30 as busy to the party connector switches I, eta, having accessthereto. Also,the line relay R340 connection, including theco ntacts 335 and 321, control wiper 323 of the wiper set and the rotary magnet M323; and completes, at the contacts 342, an obvious ground connection to one terminal of the winding .of the cutoff relay it is noted, that the party line switch 320 is of the non-homing type, whereby the Wiper set thereof engages an associated contact set at each. step of the party line switch 320. Accordingly, at this time, the idle or busy condition of the incoming trunk terminated by the engaged contact set and extending to one of l the repeaters is tested. In the event the lastmentioned trunk extends toa busy repeater, ground potential appears upon the control conthe group of special service selectors in 34I, an obvious test 321, the previously traced circuit for energizing the rotary magnet M326.

M326 then restores, thereby to drive the wiper, set

The rotary 'magnet one step in the rotary direction and. to, recomplete, atthe contacts 321, thepreviously mentionedcircuit, including the test .wiper323of the wiper set, for. testing the idle or busy condition ofthe trunk terminated by the contactset engaged by the wiper set at this time. On the other hand, in the event the wiper set engages a contact set terminating an idle trunk, no ground potential appears upon the control conductor thereof, whereby the previously traced test circuit, including the test wiper 323 and the rotary magnetM326,is.not completed. Accordingly, the

previously traced-low resistancecircuit for energizing the rotarymagnetM326 is not completed and the previously traced path for short-circuitingthe winding of the cutoff relay R330 is not completed. Hence, when operation of theparty line switch 320 is initiated the wiper set is driven a step in the rotarydirection only in the event that it'engages a contact set terminatinga busy trunk, in whichevent the by step in the rotary direction until it engages acontact set terminating an idle trunk,

Assuming that the wiperset of the party line switch 320 engages the contact set terminating the-trunk410 extending to the repeater 400 and that the latter repeater is idle at this time, no ground potential appears upon the control conductor C413 of the trunk 4-10. Accordingly, the previously traced low resistance the control wiper 323, for energizing the rotary magnet M326is not completed and the previously+traced path, including the control wiper 323, for short circuiting the winding; of the cutoff relay R330 is notacompleted). Hence, at thistime,

cutoff relay R330. 4

an obvious circuit; including the contacts 342 and 321, is completed for energizing in series the windingof the cut'oii relay R330 and the rotary magnet M320. 'When this series circuit iscompleted the cutoff relay R330 operates; however, the rotary-magnet M320does not operate due to the high series resistan e of-the-windirig of the Upon operating, the cutoff relay R330 interrupts, at the contacts 33I and 333, the previously traced circuit for energizing the winding of the line relay R340, thereby to cause the latter relay to restore shortly thereafter, the line relay R340 being of the slow-to-release type. Also, the cutoff relay R 330 completes, at-the contacts 332 and334, a circuit for energizing in series the upper windingof the line relay R450 andthe upper andlower windings of the meter relay R420 in therepater 400, this circuit extending from "ground by way of the" contacts 442, the lower Winding of R420, the line trunk 410, the line wiper conductor C412 of the 322, the contacts 334, the line conductor CI32 "of the party subscriber line I30, theprimary winding of the induction coil I01, the transmitter I02, the contacts I05 of the hook switch SI04, the impulse springs I3 and I0, the .line conductor Wiper setis driven step circuit, including 139,, t e con,

:the contacts c35,*the previously tracegi test ,cire

wip r 323 .ahothe rotary cuit between the control :magnet M625; andcompletes, at the contacts I336, an obvious -path,-in cluding :the .contacts 342 and the control w p r & l' o iapnl ihg ground potential to ztheqcontrol conductor C4153 of the trunk flztfl',ithereby to mark the itrunleflfl as busy :to the otheriparty line switches having access sthereto. Further, the .cutofi grelay vR35!) inter.- ru ts, at the contacts 313], a :point in a hom n circuit traced hereinafter ;;fo r energizing the ;rptary magnet M3152 of the 'zmefuer ;,sw' 3,5!) pre :pares, at :the contacts i3: 110i i i-ng :circuit rtraced hereinafter ior hergizing the rotary "magnet M3552; and prep tacts 1339, azcirouit traeedthereiha e 1 :ing the meter M3568 sindiyidually as o lategi .the :fourth v arty subscrib subst ti 3B4 oohheated to the zpartysubscriber iine 13o.

itll 'lpon roperatmg, the line .-re ay .3450 in th se :peater mm completes, atisthe ontacts 452, an obvious circuit tor en izin th wi dihghi ithe c holdgre'l-ay R!i6ilrthereby;to cause the latter i elny l-fio opelal'ie, Upon rei eratin the hold' elay R460 com letes, lat-the contacts 1., a 1oQ -.i., eh tex- :tending abet-tween thezrepeater A111 at: athe repeatassociat d" with the repeater Mm. [This loopucircuit 31 51 1195 f om 1? :line conductor C48! oi thetrhhls 4 by wa of rthe vcontacts A61, the impedance the le ihand winding of the answer relay 1144i! and the contacts L415] to the, line centimeter 96 1 f. the trunk148i],:-theflineconducthls C41, angi 3,482 pi zthe :tr unk [418i] being connected by way of the apparat.usiinithe repeaters lecto 5315 were iyzto battery :aahiLem hel pote tials, whereby \siye :tga di i tr hsd -repeater sele to 24.05 is thus :eohtiiticne to be thr fi g ground hois eturhed at t e centre; condu to 413 11:41!) to the c nt al heret. Thi application roof a round potent a to h control w per comp se .obviou hol ing ci cuit for eh reizinerih-setie i he win hes of t cutofi relay R330 and the rotary magnetM325 in the arty ine-sw tch 32.0- th stpoint, it is not that theaaboyeemfiniiiqnegih flding circuit is comiple e prior t the re o ati n of th i ley 3,340 in rder opre e t there ase ofcth party line switch 320. tshortly after the above-men.- =t o d h lding circuit i emp eted the l n lay sm te, re to s in o de to interrupt, at the .eontaetslfll, a iurther poi t inthe p evi usly mentioned test c r uit, incl ing the trol zwiper 3 3- ano the o a y magnet M326; an to inter upt, at the centaets he o igi al opoi the s;

the lin rel y the latter .relay noes chat oh ht ht 1 212115 time .a-s the iright hahd m ndi ithereoi is also energized zb "way bi rah @byicus circuit n ruding dent the contacts -462,=mhic;11 was i omni te however,

to the operation oi the-holdrrelayiftfifi- :Whh 2 both the lefthhand and the: hi hl ihhrl st wirlsimgs tor :the answer 128125 13440 ianesthus {energized relay does that operate, as it is-of the {n rmeri yp hc n ly, atatri-s time an operative @01 inection is completed between th fonhth :party subscriber substation :3114; connected 119 the party subscriberiiline IM, and cthe repeaters"!!! by way of the party subscriber line switch 8 2 9 and the "trunk r410 @150 the Iweater not is .operatively connected to repeat :ser lectorfifih'by way ofitheatrunki wfl; wFunt her, =tone' current -'is returned from ;the repeater seiner tor 6W5 .iby way of :the.--aboue-tracedxconnection to the receiver its :at the fourth party subscriber substation 394 in order to iindicateeto :the subhe cohtholcoherati circuit iortehergizm seri s the wind- 7 scriber line. litfirth rebyto ire alh t e Partwsub- "r 111s no ed th t at. th tim engageme t an obvious math is short-circuiting boththe transmitter 11-0-2 andethe recei-ve-r l'0'3pi-n accordance with conventional conductors- CI tim 30- The subscriber at the-c2t1lingfourth part-ysubwheel of the calling device device H1 operates, ;in the plained, in ,conjunction'with 'liigs. 1 and -2 of the drawings. Mere p arti'cularlyathe camsprings fl .harty ,subscriberjline {r30 the .ealliuaio uth scriber thereat that the first digit of the directory :number. The subscriber at the calling riourth Dart-y 511b,-

scriber substation-EM-bhen iiroeeeds to dial ime first digit-of the directoryxnumber orthe callegi first party subscriber ;substati0n 1311 l, ithenrdiree- 'tory number of the/called first party subscriber substation 81 being terclockwise direction, asviewed-intf ig. flfiniorder to move the three projections tfl'i carriedion the :periphery thereof behind. the:-associated' pawl :38,

in the manner previously :explained. "When the shunt springs 21,22 and 23 are operated into completed ffOI practice; and a direct dialing"bridge including "the primary winding of the-induction coil cm, the shunt springs 23 and 22 and the -impulse springs i 9 t and 2|), is co-mpleted betweenithe line 3-2 andC l31 of theqiartyesubscriber scriber substation 304 then -=reieases =the finger l0, whereby thebailing manner previously'exand 25 operate totransmit a -first =ground-iinpulse qver,the line conductors 361%! and C132 of-the .o. .,,th imp11 e sp i g 19. andf- -tQinte u tt e previo ly it ceq" p circuit extend n b wee party subscriber substations!!! band the repeate 4.0 h'lt ma n r p e io sly gexplaihesl- The path fo r :ap p1ying ground potenti t the line conducto $2 exte ds ,from

g ound by Way-p the ii ilhfiPIillfZSlZf end'it the shunt .sp hgizzahd the impuls springs 1.96119 while. the path'L QI e epeate ADD-and the repeater selector 405 its eompletegl djlhe le; Winding .of the answer :relay-RMQ en gra ed;

l the cna rtyilinemay proc ed to isifizail'ihe IXX, such, iorzexample, :as i 234. Whe-n'the subscriber at the calling {fourth 21, :22 and. $28 are 'p-riqr *fto the operation of ground tion.. I

terru-pts, at the contacts 452, the reviously CI32 extends from ground by way: of the cam springs and 24, the shunt springs 22 and 23 and the primary winding of the induction coil I01 to the lineconductor CI32. The application potential to the line conductor CH! of the party subscriber line I completes an alternative circuit substantially identical to that previously traced for energizing in series the,

upper winding of the meter relay R420 and the upper winding of the line relay, R450 in the re,- peater 400; while the application of ground potential to the line conductor CI32 of the party subscriber line I30 completes a path, including the contacts 334,the line wiper 322, the line conductor C412 of the trtmk 470 and thecontacts 442 for short-circuiting the lower winding of the meter relay R420. Accordingly, the line relay R450 remains in its operative position while, the meter relay R420 operates, the latter relay being of the differential type and the lower winding thereof being short-circuited at this time. Upon operating, the meter relay R420 completes, at the contacts 42 I, a circuit, including the contacts ,4! I, the conducto-rC4'l4 of the trunk 470, the wiper 324 andthe contacts'338, for energizing the magnet M352 of the meter switch 350. When thus energized the magnetM352 operates inorder to condition theuwiper 35! to be drivenone step in theclockwise direction away from its home posi- Upon complete operation of the cam springs 24 and 25 to transmit the first ground impulse, ground potential is removed from the line conductors CI3I and CI32 of the party subscriber line I30, whereby the previously traced path for short-circuiting the lower winding of the meter relay R420 is interrupted and the previously traced circuit for energizing in series thelower and upper windings of the meter relay R420 and the upper winding of the line relay R450 is re completed. When both the upper and lower windings of the meterrelay R420 are thus energized this relay restores as it is of the differential type, as previously noted; also, at this time the line relay R450 retains its operated position. Upon restoring, the meter relay R420 interrupts, at the contacts 42!, the previously traced circuit for energizing the rotary magnet M352, thereby to cause the rotary magnet M352 to restore; whereupon the wiper 35! of the meter switch 350 is drivenone step in the clockwise direction away from its home position.

The impulsesprings I9 and 20 of the calling device I0 are then operated to transmit the first impulse, whereby. the previously mentioned loop circuit extending between the calling fourth party subscriber substation 304 and the repeater 400 is interrupted and then recompleted, in an obvious manner. When the previously mentioned loop circuit is interrupted the series circuit for energizing the lower and upper windings of the meter relay R420 and the upper winding of the line relay R450 is interrupted, thereby to cause the meter relay R420 to retain its restored position and to cause the line relay R450 to restore. Subsequently, when the above-mentioned loop circuit is recompleted the previously traced series circuit for, energizing the lower and upper winding of the meter relay R420 and the upper winding of the line relay R450 is recompleted, thereby to cause themeter relay R420 to retain its-restored position and to cause the line relay R450 to reoperate. Upon restoring, the line relay R450 inmentionedcircuit for energizing the windingof the type, as previously noted. The

' 453, the pr viously hold relay R460; however, the latter relay does not restore at this time as it is of the slow-torelease type. Also, the line relay R450 completes, at the contacts 453, an obvious circuit, including the contacts 463, for energizing the winding of the dial relay R430, thereby to cause the latter relay to operate. Upon operating, the dial relay R430 completes, atthe contacts 43!, an obvious path for short-circuiting the impedance element M5 and the left-hand winding of the answer relay R440, thereby to provide alow resistance bridge across the line conductors C43! and 04.82 of the trunk 480 and positively to prevent operation of the answerrelay R440 incident to switching surges impressed upon the trunk 480. incident to operation of the repeater selector 405. Also, the dial relay R430 completes, at the contacts 433,. an obvious circuit for energizing the upper'winding of ,the digit cutoif relay R4I0.

When the upper winding of the digit cutofi relay R4I0 is thus energized this relay takes a first step in order to complete, at the contacts M2, an obvious path for, short-,circuiting the lower winding thereof. When the lower winding of the digit cutoif relay R4! 0 i thus short-circuitediit will not take a second step to interrupt, at the contacts, 4! I a prepared point inthe previously traced circuit for energizing the rotary magnet M352 of the meter switch 350. Also, upon restoring, the line relay R450 interrupts, atpthe contacts 45!,;the previously traced loop circuitextending between the repeater 400 and the repeater selector 405.

Upon reoperating, the line relay R455 recompletes, at the contacts 45!, the previously mentioned 1 9p circuit extending between the repeater 400 and the repeater selector 405,reeompletes, at the contacts 452, the previously 1nen tioned circuit for energizing the winding of the holdrelay R460, and interrupts, at the contacts traced circuit for energizing the winding of the dial relay R430 does not immediately restore as it is of the slow to-release type. At this point,

it is noted that neither the hold relayR460 nor the dial relay R430 restores during impulsing;

both of these relays being of the slow-to-release first restoration and reoperation of theline relay-R450 is efiective totransmit an impulse overthe trunk 480 to the repeater selector 405, thereby to cause the repeater selector 405 to take one step in the vertical direction, in an obvious manner. 1 i

During the subsequent operation of the calling device I0 the cam springs 24 and 25 operateto transmit their second ground impulse; then the impulse springs i9 and 20 their second impulse; and, finally, the cam springs 24 and '25 operate to transmit their third ground impulse; at which time the finger wheel of the calling device I0 is returned to its normal position and the first digit .2 has been transmitted therefrom! The second and third ground impulses transmitted by. the cam springs 24 and 25 of the calling device I0 cause the meter relay R420 to operate and then restore two additional times; wherebythe meter relay R420 is operated and then restored three times incidentto the to transmit the operation of the calling device I0 digit 2, in the manner explained above. This operation of the meter relay R420 causes the wiper 35! of the meter switch 350 to be advanced three steps away from its normal position in the clockwise direction, in the manner explained above. The second impulse transmitted by the impulse springs I 9 .and 20 of the calling device I0 causes dial relay R430; however, the

operate to transmit The repeater selector-'40?) respondsto the first digit 2 transmitted thereto toadvance/its set two steps in the vertical direction; whereupon the wiper set thereof .is operated automatically in the rotary directiontolselectan idleiparty iconnectorI-in the group, including the .i'party con- 3 fne'otor"40I in anobv'rouslmanner. Assumingthat the party connector 40I is seizedhy the repeater selector 405, theparty-conneotor 40I is thenconditioned to bel responsive to the second and third digits 3 and 4, "respectively, in accordance conventional practice.

At the conclusion of the'firstxdigit 2', theiiine relay R450 reoperates, thereby to interrupt, at the contacts 453, the previously traced circuit for energizing thewindin'g :of thedialrelay R430,

.whereuponthe latter relayrestores-shortlythereafter as no further -restoration of the line relay R450 occurs until'the subscriber at the calling fourth party subscriber substation 3.04 dials the second digit 3. Upon-restoring, thed-ial relay R430 interrupts, -at the contacts 433, th'epr'e viously traced path for shorucircuitingtheiower winding of the digitcuto'ii relay R4I0, whereby an obvious I circuit, including the contacts 464 and M2, is completed for energizing in series *the upper and lower windings of :the' digi-t cutoff relay R410. 'When theabov'e-tracedcircuit for energizing 'in series the upper and lower windings of the-digit-cutoff relay R410 is completed,

this relay takes a. second stepor-"operates fully, thereby to interrupt, at the contacts 411, a fur ther point in the previously traced-circuit for energizing the rotary magnet M352.

At this time, the wiper thereby to prepare-a circuit traced hereinafter for operating the meter M3 8 individually associated with the fourtharty subscribersubstation 304 connected to the partysubscriber --l ihe I730.

The subscriber at the calling party subscriber substation 304 then proceeds to dialthe-second digit :3, thereby to'cause the line relay R450 to restore and reoperate three times "in order to transmit the three impulses of the sec'on-ddigit over the trunk 480 and the repeater selector 405 to the party connector 40I. Incident to the dialing of the second digit -o, 'the'eallihg device In operates, in the manner explained above,

connection with the dialing of the first di 1; 2, whereby the meter relay R420v operates andre Stores three times. Howevehthis operation or the-meter relay R420, incident to the dialing of the second digit .3,'is without effectdue to the fact that the digit cutoff relay R410 occupies its fully operated position at this time,"as the last= mentioned relay was fully'operated at the :conclusion of thefirstdigit '2' incident to the restoration of the dial relay R430, in the manner previously explained. Finally, .the'subscriber at the calling party subscriber substation 304 proceeds to dial the third idigit'i-thereby to cause the line relay R450 to restore and ireoperat'e four times in order to transmit the tour impulses or accuser I the third *di'git "over the "trunk I180 "and the "repeater selector 405 to the party connector j40-I. qhlso, incident to the dialing of the third dig it i, the meter-relay R420 operates and restores three times; however, this o'peration'of the'met'ei' relay R420 is without elre'ct due to the fully operated position of the digit cutofi reIay RM'O. In'vi'ew of the foregoing explanation of -the' ope'rz'it'ioh or the meter relay R420, incident to the'dialingbf the second and third digits, it will beu'nderstood that this relay is-e'ffective-to control the settin of the-meter switch 350bnlyincident-to the dialing of thefirst digit ofthe directorymembendue to the full operation'iof the digit cutofirel'ay R4I0 at the conclusion of the first digit of the'directory number.

The partyconnector 40I responds to thesecond digit -3 and the third digit '4 in accordance with conventional practice-inorder to seize the party'subsoriber line I20. Upon seizin'gthe party subscriber line I20, theiparlty connector 40I tests the idle or busy condition thereof; whereupon busy tone current isreturned over the repeater selector 405, the trunk 480, the repeat-M 400, the trunk 410, the party line switch 320 and the party subscriber line I to the calling fourth party subscriber substation 304 in the event the calledparty subscriber line I20 is busy at this time. On the other hand, in the event the called party subscriber line I20 is idle at this time, the party connector 401 operates in order to -return ring-back tone current over the previously traced connection to the calling fourth party subscriber substation 304 connected to "the party subscriber line I30; and toiproje'ct 16 cycle 'ring'ing'current over the called party subscriber line I 20. The 16 cycle ringing current projected over the called party subscriber line I20 causes operation of only the harmonic ringer at the called first part-y subscriber substation 3 I I connected to the party subscriber line I20 due tothe fact that the har -I of' the meterswitch I o 350 has been operated three steps in-"the clockwise direction away from its normal position,

monio ringers (11513058121125 the second, third and fourth subscriber substations -3I2, 3I3 and 3I4, respectively, connected to the party subscriber line I20, are respectively tuned to ringing currents having the respective frequencies of 33, 50 and 66cycles.

The subscriber at the called first party sub scriber substation-3H, connected to the party subscriber line I20, answers the call by removing the receiver of the telephone instrument thereat from its associated switchho'ok, thereby t'o complete an obvious operative connection, including the party subscriber line I20, between'the first party subscriber substation 3H and the party connector 40I. When this connection is com pleted the party connector 40I operatesinorder to reverse battery over the repeater selector 405 and the loop circuit extending between the repeater selector 405 and the repeater 400, 'When' batteryis thus reversed over the above-mentioned loop circuit the left-hand winding of the answer relay R440 is energized in the opposite direction, in an obvious manner, whereupon the answer're lay R'440 operates. Upon operating, the answer relay R440 interrupts, at the contacts 44-2,- the previously traced circuit for-energizing series the lower and upper windings of the meter relay R420 and the upper winding of the line may R450; and completes, at the contacts 44I, an obvious alternative loop circuit for energizing-in series the upper and lower windings of-the meter relay R420 and the upper and'lowerwindihgs or the line relay R450, whereby the loop circuit ex tending between the folilth party slibsi ibei sfili 'by way of the condensers station 304, connected to the party subscriber line I30, and therepeater 400 is balanced in order to 350 for operating the meter M308 individually associated with the fourth party subscriber substation 304, connected to the party subscriber line I30 in order to register the completion of a call from the last-mentioned station.

At this time, the previously traced loop circuit extending between the calling fourth party subscriber substation 304, connected to the party subscriber line I30, and the repeater 400 is completed; the previously tracedloop circuit extending between the repeater 400 and the party connector 40I is completed; and the previously mentioned connection extending between the called first party subscriber substation 3II, connected to the party subscriber line I20, connector 40I is completed. Finally, it is noted that an operative connection between the trunk 410 incoming to the repeater 400, and the trunkv 480 outgoing from the repeater 400, is completed M3 and M14. Hence, an established connection is completed between the calling fourth party subscriber substation 304, connected. to the party subscriber line I 30, and the called first party subscriber substation 3, connected to the party subscriber line I20, for two-way communication purposes. 3

The release of the established connection between the calling fourth party subscriber substation 304, connected to the party subscriber line I30, and the called first party subscriber, substation 3I I, connected to the party subscriber line I 20, is primarily unclerthe station 304, and is accomplished when the subscriber thereat replaces the receiver I03 upon its associated switchhook, thereby to operate the hook switch SIM. When the hook sWitchSHM is thus operated the transmitter I02 and the receiver I 03 are effectively disconnected fromthe party subscriber line I 30 and the previously traced loop circuit extending to the repeater400 is-inter rupted, at the contacts I05 of the hook switch SI04, thereby to cause the line relay R450 in the repeater 400 to restore. Upon restoring, the line relay R450 interrupts, at the previously mentioned circuit for energizing the winding of the hold relay R460, thereby to cause selector 405, and the previously mentioned circuit for energizing theleft-hand winding of the answer relay R440. When the previously mentioned loop circuit extending'between the repeater 400 and the repeater selector 405 is thus interrupted, the answer relay R440 in the repeater 400 restores and the repeater selector-405 is released in order to efiect the release of the party connector 40I; When the repeater selector 405 is thus released the application of ground potential isremoved from the control conductor C483 ofthe trunk 480, thereby to interrupt the previously traced holding circuit for energizing in seriesthe' winding of the cutoffparty subscriber sub-- and the party 1 contacts 452, the

control of the subscriber at the calling fourth party subscriber sub- Q at the contacts and the contacts step in the clockwise direction.

gizing the rotary magnet M352 line switch 320 iscompletely nonhoming type.

9 magnet M326 in the party line switch 320, in order to cause the latter relay to restore.

Upon restoring,,the hold relay R450 interrupts, 464, the previously traced circuit for energizing in series the upper and lower windings of thedigit cutoff relayR4I0, thereby to cause the latter relay to restore. Also, upon restoring, the answer relay R440 interrupts, at the contacts 443, the previously traced circuit for energizing the meter 'M308 with the fourth party subscriber this time the repeater 400 is completely released and is marked as idle to the partyline switches having access thereto by the absence of potential upon the control conductor 0413 of 410. 1 3

Upon restoring, the cutoif relay R330 in the party line switch 320 interrupts, at thecontacts 336, a further point in the previously tracedcircuit for energizing in series the winding of the cutofi relay R330 and the rotary magnet M326, and completes, at the contacts 331,,an obvious circuit including the set ofswitch springs S354 353 for energizing the rotary magnet M352. At this point it is noted that the set of switch springs S354 i actuated into engagement when the wiper I of the meter switch 350 is rotated in the clockwise direction away from'its home position. When thus energized the rotary magnet M352 operates tointerrupt, at the contacts 353, the previously traced circuitfor energizing the rotary magnet M352, and to condition the wiper 35I tobe driven'an additional When the previously traced circuit for energiz' g the rotary magnet M352 is interrupted the, latter magnet restores, thereby to recomplete, "at the contacts 353, the circuit for energizing the rotary magnet M352 and to drive the winter 35I one step in the clockwise direction away from its view of the foregoing explanation of the mode of operation of thei'otary magnet M352, it will be understood that it is intermittently energized,

' thereby to drive the wiper 35I of the meter switch 350 step by step in the clockwise direction back into its'home position. When. the wiper 35I of the meter switch 350 is driven back into its home position the set of switch springs S354 is actuated into disengagement, thereby to interrupt afurther point in the previously traced circuit for enerin order positively to arrest further operation thereof. At this time the meter switch 350 is completely released-; and restored to its normal position and the party released. It'is again noted that thewipe'r set of the party line switch 320 remains in engagement with thecontac-trset terminating the trunk 470 extendingto the-repeater 400, as the party line switch 320 is of the Also, when ground potential is removed from the control conductor C413 of the trunk 410, the application of ground potential to the, control conductor CI33 of the party subscriber line [I30 is interrupted, thereby to mark the last-mentioned party subscriber line as idle to the party connectors 40I; etc, having access thereto. Also, at this time, the party subscriber line I20 is marked as idle to the partyconnectors 40I, etc.

having access thereto, assuming that the subscriber atthe called partysubscribensubstation 3II has replaced'the receiver of the telephone instrument thereat upon its associated switchrelay R330 and the rotary hook. He'ncegithe established connection between individually associated substation 304, connected to the-party subscriber line I30. At 5 the trunk home position. I In -t'ion '304, connected to directory numbers of the second,'third:an'd fourth therefrom' "l in operations of meters M305,

vidual connectors. Also;'it-1will- .the extension or ea connection eiromranzindivldual "is substantially theasame res that whereby no:metering' iszefrected;

the, calling 'fourth pa'rtysubscribersubstation 304, connected to "the party subscriber line il 30, =and the called "first party -:subscriber substation 3 l l -connected to the par ty "subscriber'line 120, is "completely released at this time.

In view of *the: foregoing explanation of "the mode of operation o'f' the apparatus incorporated in the telephone system to extend :a connection 'from the calling fourth partycsubscriber substathe part subscriber line 130, to =the called first party subscriber substation 3 H 'connected to the party I subscriber line '120,it will be understood that a-call;may 'be ex- "tendedtherefrom to'the called "second, third :or fourth party subscribersubstations '3l 2, 3-13 or 3Hl, respectively, connected to the party subscriber line 120, in a substantially identical man- "ner by'dialing the appropriate directory number. As'WiH be apparent from the trunking p'lan; the

party subscriber-substations 3112531 land 31 4pm- -'spectively,-connected to the party 'subscriber line 1'20 are '3XX, 4XX and EXX or 334, 434 :and 534, respectively, in accordance with ithedoregoing-examp'le. "The party connectors 4 402, '40 4 respectively respondito the: digits 1, 2, 3 ande, "in accordancewithithe foregoingexample, to seize theparty subscriber -line 'li2'0 and respectively'ring rtheseizedparty subscriber line l 2'0 with ringing currents of the following frequenciesz f-lfi cycle, 33 cycle, 50' cycle andifidcycle. flfhe' ringing currents of the respective frequenciesmentioned PIG.

"jected over "the *called party: subscriber :line 120 'operate the harmonic ringers atfithe respective "first, second; third "and "fourth *party subscriber "substations 23 H [2, 313 and 3 M; connected fto the party subscriberline 1 20.

Also, it will be understood tha't;a ="call may he extended from the first, second orzthird-party subscriber substations 301,1302 "or 303, respecatively; connected to'fthe party subscriberline -l 130, to anyone" of the '=etc., connected to ithe party subscriber "line 7120, =in-a manner "substantially identical to fthat texplained :above. I iHowevenfin the l ab'ove mentioned "cases; "when the -'calling devices at the.:iresr1ective first, second -*an-d"third party-subscriber :substaitions 30 l '302 a'nd 303', respectively,zconnectedfio the party subscriberxline i130 zareoperatedgno ground 1' impulses; "one ground iimpulse 4andwtwo ='ground impulses are respectively stransmitted "order 'to cause 'i'the :corresponding the *rneter switc'h 13,50; awherebyithe M-3106 'andZM30l :respectively. cortresporidingtc) the 'first, second and :thirdynarty subscriber substations 71301, 3.02 rand 1 30.3, ":IBSPQG- tively, are operated in sorderitoiregister :the initia- "tion'o'f a call from the corresponding-party subscriber substation.

Further, it will =tbe tunderstood that ithe extension of a call from one of the ipartyvsubscriber substations, connected :to aparty subscriber. line, *to an individualsubscriberisubstation, connected toan individualtsubscriberiline, is substantially the "same "as that described above, whereby :the "appropriate meter :is rcontrolled nin 'the :manner ==previouslyexplained; "the rel-bore amentioned connaction-us 1 extended :by way not one of the indibe understood that 'subscriber'substation,tconnected totan individual subscriber line, to :"one :c'f tithe s-party subscriber substations, iconnected to aa'partyzsubscriber line, describedwabove, "theaboveemen- "the party 3403 and partyrsubscni ber;substations'vfil'l ftioned connection *is :extended ::by way of the appropriate one of the 0 party :connectors A0 I :etc. Finally, it is notedithat the extension of a call firom :an' individual subscriber substation, .con- "5 nected toganiindividualsubscriber 1ine,to ant-individual subscriber substation, connected to; an individual "subscriber dine, :iS in accordance with conventionalvpractice, "whereby 'no ,metering is I effected; the above-mentioned connection-- is ex- *ten'ded by way of one of the--individua1 cori- "n'ectors.

:Considering 'ithe extension of "a call from -:a party subscribersubstation, connected to a party "subscriber line, such,. for example, as the fourth 5:15 party subscriber substation 304, connected tothe :party subscriber I line 130; tO- the manual oper- "ator position 0, it -'=is pointec1 out that the initia- =tion and extension of the 'call from the calling fourth party subscriber "substation 304 by way of line switch 320,-'the trunk 4210, the "repeater -i400 rand the trunk 480 to "the repeater selector 405; are the-same :a-s that previously exfplained. Atthis itime the subscriberfiat the :calling (fourth-party subscriber 'substation"*3 04 dials the 'single-digit o, whereby i'operatesiin'order'to seizeanidle one of the'trunks -':in th *group -extending to the manual operator p osition 0. "Theoperatorrat the manual-operator :position 0 answers-#the call "inaccor'dance with auaconventionalpractice, iwhereby an established :eonn'ection is tcompleted between the=ca1ling rfourthparty-subscriber substation 304, connected to the party subscriber line 130, an'd' the :called i manual operatorposition 0. In connection with 13116 extension of t'he above-mention-ed call, it is noted that the operation of the'meterrelayRMil in .the "repeater 400 and the meter'switch 350,

-incident'to 'the operation or :thecalling device 10 :at the fourth party subscriber substationx304 to transmit the digit 0, is the "same as that pre- -=vious'ly:explained.- However; itis pointed out that the above trace'd connection 1 does not include *a ''connector. Accordingly, when-the operator at the manual operator1position 0vanswers the'call, battery potential is not reversed over the trurik 480 toitheirepeater 400. Hence,ithe'answer-relay TRMU-iin the repeater 400' does not -'operate in order to :effect 'operation' ofthe *meter M3 ini position :10, vin the-zmanner:previously explained,

thehmeter M'30i8iisznot operatedwto meter 1theica11 when -.the :ioperator at the-manual operator :posianon-=30 answerstheacall.

iConsidering "now ithe-crextension iof ;a.=:call :ifrom :a partyvsubscribensubstation comlectedto;a party 5 vsubscriber :line; such-,ri or example, -:as- :the :fourth partyssubscriber substation-5M, .1connected;to :the

W-party '-,subs0ri'ber line 1 3.0,v :to the toll zoperator position v.l l0 ,litliS :pointed iout-thatxthe :initiation :andextensionmf :the acalliufromzthercalling fourth 7 party subscriberqsubstation =-304- .by may:

,party line 1 switch 320,:ithe trunk-0T0, ,etherreneater 400 and. =-.the;trunk A80 to ,the repeater selector x405, are the same ras that, previously explained.

.;At this. time the :subscriberiat ithe calling irourth ;party subscriber:substatiomtM;dials2the directory the repeater selector 4'05 of. ithe number H0, whereby the repeater selector trunk to the toll operator position i nected to the party subscriber party station incident to 405 responds to the first digit 1 to select, an idle special service selector, such,for example, as the special service selector 406. The special service selector 400 responds to the second digit;1 and dropsback in a manner well understood, and then responds to the third digit to select an idle H0. The operator at'the toll operator position 0 answers the call in accordance with conventional prac tice, whereby an established connection is com;

pleted between the calling fourth party subscriber substation 304, connected to the party subscriber line I30, and the called toll operator position H0. In connection with the extension of the abovementioned call, itis noted that the operation of the meter relay R420 in the repeater 400 andthe meter switch 350, incident to the operation of the calling device ID at the fourth party subscriber substation 304 to transmit the first digit 1, is the ing a normal same as that previously explained. However, it

is pointed out that the above-traced connection does notinclude a connector. Accordingly, when the operator at the toll operator position ll 0 answers the call, battery. potential is not reversedover the trunk 480 to the repeater 400. Hence, the answer relay R440 in the repeater 400 does not operate in order to effect operation of the meter M301 individually associated with the calling third party subscriber substation 303, coiiline I30, in view of the fact that the above-mentioned call isa free call which isnot metered. Thus itwill be understood that, although the meter switch 350 is set to select the meter M! incidentto the dialing of the first digit 1 upon the calling device I0 at the calling fourth party subscriber substation 364 to extend the above-mentioned call to the toll operator position H0, in the man ner previously explained, the meter M301 is not operated to meter the call when the operator at the toll operator position I I0 answers the call.

In connection with the extension of the above mentioned call, it is noted that incident to the operation of the calling device I0 at the calling fourth party subscriber substation 304, connected to the party subscriber line I30, to transmit the first digit. 1 to the line relay R450 in the repeater 400,this calling device l0 also sends two ground impulses to the meter relay R420 in the repeater 400, thereby to cause the meter switch 350 to select the meter M301 individually associated with the third party subscriber substation 303 instead of the meter M308 individually associated with the calling fourth party subscriber substation 304 as previously noted. However, the selection of the improper meter M301 350 in connection with the extension of the above-mentioned call is immaterial as the meter previously mentioned copending application of John E. Ostline, Serial No. 404,103, filed'July 1941.

While there has been described what is at present considered to be the preferredembodiment of the invention. it will be understood that ,various modifications may be made therein, and it is contemplated to cover in the appended claims it has been operated,

turn of said setting member a ber of times depending upon the extent of the operation of said setting member, and asecond impulse sender operated only during the return of said setting member a fixed number of times regardless of the said other position to which said setting member has been operated.

2. In a callingdevice, a setting member havposition and being variably operable away therefrom to a plurality of other positions, means for returning said setting member back to its normal position after it has been operated, a first impulse sender operated only during the return of said setting member a variable number of times depending upon the extent of the operation of said setting member, a secondimpul'se sender operated only during the refixed number of times regardless of the said other position to which said setting member has been, operated, and means for adjusting said second impulse sender to. establish difierent fixed numbers of times of operation thereof.

J3. In a calling device, a setting member having anormal position and being variably operableaway therefrom, means for returning said setting member back to its normal position after a first impulse sender operated intermittently during the complete return of said setting member, wherebya variable number of impulses is sentby said first impulse sender depending upon the extent of the operation of it has been operated, contacts, and means by the meter switch 1 of the operation of said operated intermittently during only the last por-- tion of the return of said setting member, whereby a fixed number of impulses is sent by said second impulse sender regardless of the extent of the operation of said setting member.

4. In a calling device, a setting member having a normal position. and being variably operable away therefrom, means for returning said setting member back to its normal position after first and second impulse actuated only during the return of said setting member for operating said first impulse contact a variable number of times depending upon the extent of the operation of said setting member and for operating said second impulse contact a fixed number of times regardless'o-f the extent of the operation of said setting member, said last-mentioned means being so arranged that said impulse contacts are operated alternately;

5. In a calling device, a setting member having a normal position and being variably operaclosing said second pair of impulse contactsa.

fixed number of times regardless of the extent setting member, said lasta normal position and vposition after it has been :menticnedameans being ozarliang'ed that said first pair of impulsewcontacts ishopened wvhi-le said second pair of impulseacontactsis open'and that saidisecond pair of impulse contacts is closed while-said first pair of. impulsecontacts is closed.

v 6. ;In1a calling-device, .a setting member having .being 1 variably r operable away therefrom, means for'returning said setting member back-to its normal position after,it:has

pair of impulse contacts, and i been operated, a means actuated during the: return of said setting member for opening said pair ofimpulse contacts a variable numbervof times depending upon the when they, are closed a fixed number of times regardless of the extent of the operation of said setting member.

erated through a gear .train from said arbor-only dial to send a variable during the returnof said number of impulses depending upon the extent of theirotation of said dial, and a second impulse sender operated directly bye, member carried by said. arbor only duringithe returnof said dial .to

variably rotatable away there extent of theooperation ofrsaid setting member and for grounding saidpair of impulse contacts send a fixed number ofimpulses regardless as to which of said other positionshsaid dial-has been operated. v

8. Ina calling device, a, dial havin a n rm position and being variably rotatable awayrtherefrom, an arbor operatively connected. to saiddial, means for returning, saidrdialback toits normal rotated, a first impulse sender operatedthrough a gear train from said arbor. only .duringthe return of said dial to send a variable n mber of impulsesvdepending upon theextent oftherotationoisaid dial,.a second impulse sender operated directly vby a member fo -carried by; saids-arboreonly-.:during the: returniof said-dialtosend a fixed; number not impulse -oreeam-less iofrthe extent of the: rotation iofesaidadial, rand means for 1' adjusting the position of said "member-with respect to said sarborytherebyito .--,establish different fixednumbersiof impulses-tube sent by saidsecond impulse sender.

.9. ,.-In a calling 1 device, a dial :having a; normal r position :and being variably rotatable away there- .from, .an-arbor operativelyconnected to said dial,

means forireturning said. dial back-'to i-ts-normal position after it has been rotated, a i first; set v of impulse-springs, means including a gear train op- ;eratedfrom said arbor during the return of .said dialzfor actuatingsaidfirst set of impulse springs tdsend -avariable, number -of,impu1ses depending 'upon; the extent v of the rotation of said dial, ea ssecond seti of impulse. springs, and means includingiacam-pawl mechanism disposedibetween said xarbor and said secondset of impulse springsand operated during the return of said .dial foraactuating;-,said-second set ofuimpulse springsito send a fixednumber of impulses regardless of there):-

tent or the rotation-of said vdial.

, 110. In iaucalling device a dialhavingf a; normal position 'a-ndbeing-rvariably .rotatable..awayrtherefrom, an arbor operatively connected to said dial, means ior returningsaid dialbaok toits .normal position after it has been rotated, a first set of impulse springs means including a, gear trainoperated from saidrarborrduringrthereturn otsaid dial for. actuatingpsaidfirst set of impulse springs to send a variablenumber of impulses depending upon the extent .of the rotation of said dia1,..a second set of impulse springs. and means including a cam carried by said arbor and a cooperating pawl .carried by one of the impulse springs .of..said secondset and operatedtdu'ring the return oirsaid dial for actuating 7 said second set of i impulse springsto sendra fixed number ofeimpulsesfres. gardless of the extent of .therotation, of saiddial.

.J OHN IELLIS A 'OSTL'INE.

CERTIFICATE OF CORRECTION.

Patent No. 2,566,6 l-7- January 2, 1915.

JOHN ELLIS OSTLINE.

It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Page 12, first column, line 55,- claim 7, for the word "operated"-read "rotated"; and

that -the said Letters Patent should be read with this correction therein that the same may conform to the record of the dase in t t t Office. Signed and sealed this 27th day of March, A. D. 1915.

Leslie Frazer (Seal) Acting Commissioner of Patents. 

